Mia deliberately doesn't go to the beach, at least right now! I may change that later, but I wanted to start with the other 4 only first. I plan on creating a feature in the future where, if your relationship with a housemate is high enough, you can call them to a location!
That will be some time though, as I'd first like to make unique dialogue for each location. I also plan on making plenty of beach focused events!